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Halldór Geirsson - Dósent

Halldór Geirsson

–

Verkfræði- og náttúruvísindasvið

Halldór Geirsson

Dósent

Jarðeðlisfræði

Aðsetur
Askja / N-323
Sími
5254490 8927715
Tölvupóstur
hgeirs [hjá] hi.is

Starfseining
Jarðvísindadeild
Vefsíða
https://notendur.hi.is/~hgeirs/

ORCID vefsíða
https://orcid.org/0000-0003-2056-1588
Rannsóknagátt – Halldór Geirsson

Útgefið efni

2024

Fracturing and tectonic stress drive ultrarapid magma flow into dikesScience
The role of GNSS monitoring in landslide research
Influence of climate change on magmatic processes
New MT surveys and 3D resistivity imaging beneath the Ngozi-Rungwe volcanoes at the triple rift junction of the East African Rift System in SW TanzaniaGeothermics
2021–2023 Unrest and Geodetic Observations at Askja Volcano, IcelandGeophysical Research Letters
On the MoveGeophysical Research Letters
Imaging and modelling the subsurface structure of the Rungwe Volcanic Province in SW Tanzania with aeromagnetic dataJournal of African Earth Sciences
The Geodetic Signature of Bookshelf Faulting in NicaraguaTectonics
Widespread fracture movements during a volcano-tectonic unrestBulletin of Volcanology

2023

Interaction between propagating basaltic dikes and pre-existing fracturesJournal of Volcanology and Geothermal Research
Deformation, seismicity, and monitoring response preceding and during the 2022 Fagradalsfjall eruption, IcelandBulletin of Volcanology
Joint Bayesian Modeling of Velocity Break Points, Noise Characteristics, and Their Uncertainties in GNSS Time SeriesGeophysical Research Letters
The destabilization of a large mountain slope controlled by thinning of Svínafellsjökull glacier, SE IcelandJokull
The eruption in Fagradalsfjall (2021, Iceland)Natural Hazards
Pressure increase at the magma-hydrothermal interface at Krafla caldera, North-Iceland, 2018–2020Journal of Volcanology and Geothermal Research
Correction to: Deformation, seismicity, and monitoring response preceding and during the 2022 Fagradalsfjall eruption, IcelandBulletin of Volcanology

2022

Precursor-free eruption triggered by edifice rupture at Nyiragongo volcanoNature
Cascading Hazards in a Migrating Forearc-Arc SystemJournal of Geophysical Research: Solid Earth
New multibeam mapping of the unique Ikaite columns in Ikka Fjord, SW GreenlandMarine Geology
Crustal response to inflation imaged by mapping of subsurface faults, slip directions, and stress changes during the 1993–1998 unrest in Hengill, SW-IcelandJournal of Volcanology and Geothermal Research
Deformation and seismicity decline before the 2021 Fagradalsfjall eruptionNature
Conduit formation and crustal microxenolith entrainment in a basaltic fissure eruptionVolcanica
Reservoir characterization of the Paka geothermal system in KenyaGeothermics

2021

Inflation-Deflation Episodes in the Hengill and Hrómundartindur Volcanic Complexes, SW IcelandFrontiers in Earth Science
Geothermal, Tectonic, and Magmatic Stress Interactions in the Hengill Area, Iceland
Multi-Dimensional Inversion of Electromagnetic Data from Alalobeda, Tendaho Geothermal Field in NE-Ethiopia and its Geothermal Significance
Seismicity Patterns Due to Magma Intrusions Underneath Geothermal Power Plants
Temporal Variations in Ground Deformation Caused by Geothermal Processes in the Hengill Area, SW Iceland, During 2009-2019
Induced Earthquakes in the Hellisheiði Geothermal Field, Iceland
Using Seismicity to Map Fractures in Hengill, SW-Iceland
Strain Partitioning and Interseismic Fault Behavior Along the Caribbean-South American Transform Plate BoundaryTectonics
Ground Deformation After a Caldera CollapseJournal of Geophysical Research: Solid Earth
Temporal Seismic Velocity Changes During the 2020 Rapid Inflation at Mt. Þorbjörn-Svartsengi, Iceland, Using Seismic Ambient NoiseGeophysical Research Letters
GEORG Geothermal Energy Research Cluster Initiative
Assessment of Reservoir Processes Induced by Geothermal Utilization at Reykjanes, SW-Iceland, Inferred from Interferometric Analysis of Satellite Images 2005-2019
Eruptive history and volcano-tectonic evolution of Paka volcanic complex in the northern Kenya riftJournal of African Earth Sciences
Partial melt generation and evolution of magma reservoir conditions at the Paka volcanic complex in KenyaLithos
The 2014–2015 complex collapse of the Bárðarbunga caldera, Iceland, revealed by seismic moment tensorsJournal of Volcanology and Geothermal Research

2020

Geodynamics of Iceland and the signatures of plate spreadingJournal of Volcanology and Geothermal Research
Fault Creep and Strain Partitioning in Trinidad-TobagoTectonics
Injection-induced surface deformation and seismicity at the Hellisheidi geothermal field, IcelandJournal of Volcanology and Geothermal Research
Updated geothermal model, power capacity estimates and financial model for resource development in Paka geothermal Field
Unexpected large eruptions from buoyant magma bodies within viscoelastic crustNature Communications

2019

The effect of fluid compressibility and elastic rock properties on deformation of geothermal reservoirsGeophysical Journal International

2018

Magma movements in volcanic plumbing systems and their associated ground deformation and seismic patterns
Single-Station Seismo-Acoustic Monitoring of Nyiragongo's Lava Lake Activity (D.R. Congo)Frontiers in Earth Science
A Preseismic Strain Anomaly Detected Before M6 Earthquakes in the South Iceland Seismic Zone From GPS Station VelocitiesJournal of Geophysical Research: Solid Earth

2017

Multidimensional Small Baseline Subset (MSBAS) for volcano monitoring in two dimensionsJournal of Volcanology and Geothermal Research
Deep magma accumulation at Nyamulagira volcano in 2011 detected by GNSS observationsJournal of African Earth Sciences
Volcano-tectonic deformation in the Kivu Region, Central AfricaJournal of African Earth Sciences

2016

Assessing the likelihood and magnitude of volcanic explosions based on seismic quiescenceEarth and Planetary Science Letters
Continuous subsidence in the Thingvellir rift graben, IcelandJournal of Geophysical Research: Solid Earth

2015

Stable and unstable phases of elevated seismic activity at the persistently restless Telica Volcano, NicaraguaJournal of Volcanology and Geothermal Research
TThe 2012 August 27 M_w7.3 El Salvador earthquakeGeophysical Journal International
Tectonic inversion in the Caribbean-South American plate boundaryTectonics

2014

Volcanic plume height correlated with magma-pressure change at Grímsvötn Volcano, IcelandNature Geoscience
Segmented lateral dyke growth in a rifting event at Bárðarbunga volcanic system, IcelandNature
Kinematics of the western CaribbeanGeochemistry, Geophysics, Geosystems
Multidisciplinary observations of the 2011 explosive eruption of Telica volcano, NicaraguaJournal of Volcanology and Geothermal Research

2013

GPS landmælingar
Seismicity accompanying the 1999 eruptive episode at telica volcano, nicaraguaJournal of Volcanology and Geothermal Research
New insights into volcanic activity from strain and other deformation data for the Hekla 2000 eruptionJournal of Volcanology and Geothermal Research

2012

Volcano deformation at active plate boundariesJournal of Geophysical Research B: Solid Earth

2011

Localized uplift of Vatnajökull, IcelandJournal of Glaciology
Locking depth and slip-rate of the Húsavík Flatey fault, North Iceland, derived from continuous GPS data 2006-2010Geophysical Journal International
Increased capture of magma in the crust promoted by ice-cap retreat in IcelandNature Geoscience

2010

Intrusion triggering of the 2010 Eyjafjallajökull explosive eruptionNature
Katla and Eyjafjallajökull Volcanoes
Overview of results from continuous GPS observations in Iceland from 1995 to 2010Jokull
Climate effects on volcanismPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
The 2008 May 29 earthquake doublet in SW IcelandGeophysical Journal International

2009

Glacial rebound and plate spreadingGeophysical Journal International
A deep seated magmatic intrusion at Upptyppingar, Iceland, during 2007 and 2008
Recent deep-seated magmatic activity and the 2008 M6.3 earthquake
Consequences of local surface load variations for volcano monitoring: Application to Katla subglacial volcano, Iceland
Present day geodynamics in Iceland monitored by a permanent network of continuous GPS stationsJournal of Geodynamics
A complex earthquake sequence captured by the continuous GPS network in SW IcelandGeophysical Research Letters

2008

Earthquake swarms at Upptyppingar, north-east IcelandStudia Geophysica et Geodaetica
Multiple volcano deformation sources in a post-rifting periodJournal of Volcanology and Geothermal Research
Strain accumulation along an oblique plate boundaryGeophysical Journal International
Crustal deformation in Iceland: Plate spreading and earthquake deformationJokull
Seismic and geodetic insights into magma accumulation at Katla subglacial volcano, IcelandJournal of Geophysical Research: Solid Earth
Seismic and geodetic insights into magma accumulation at Katla subglacial volcano, IcelandJournal of Geophysical Research: Solid Earth

2007

Glacio-isostatic deformation around the Vatnajökull ice cap, Iceland, induced by recent climate warmingJournal of Geophysical Research: Solid Earth
Discriminating volcano deformation due to magma movements and variable surface loadsGeophysical Journal International

2006

Kinematic models of plate boundary deformation in southwest Iceland derived from GPS observationsJournal of Geophysical Research: Solid Earth
Volcano geodesy and magma dynamics in IcelandJournal of Volcanology and Geothermal Research
Current plate movements across the Mid-Atlantic ridge determined from 5 years of continuous GPS measurements in IcelandJournal of Geophysical Research: Solid Earth
Icelandic rhythmicsGeophysical Research Letters

2005

Forecasting and monitoring a subglacial eruption in IcelandEos
Seismicity in Iceland 2004Jokull
Virkni í Kötlueldstöðinni og nágrenni hennar síðan 1999 og hugsanleg þróun atburðarásar
Forecasting and monitoring a subglacial eruption in IcelandEos

2004

Coseismic stress changes and crustal deformation on the Reykjanes Peninsula due to triggered earthquakes on 17 June 2000Journal of Geophysical Research: Solid Earth

2003

Deformation of Grímsvötn volcano, IcelandGeophysical Research Letters
Þrýstingur vex undir KötluNáttúrufræðingurinn

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